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황준영,길용석,김정익,최만수,정석호,Hwang, Jun-Yeong,Gil, Yong-Seok,Kim, Jeong-Ik,Choe, Man-Su,Jeong, Seok-Ho 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.11
The effects of SiCl$_4$addition on flame structures have been studied in flame hydrolysis deposition (FHD) processes using Coherent anti-Stokes Raman spectroscopy (CARS) and planar laser induced fluorescence (PLIF) to measure temperatures and OH concentrations, respectively. The results demonstrate that even a small amount of SiCl$_4$ addition can change thermal and chemical structures of H$_2$/O$_2$ diffusion flames. When SiCl$_4$ is added to a flame temperature decreases in non-reacting zone due to the increases in both specific heat and density of the gas mixture, while flame temperature increase in particle formation zone due to the heat release through hydrolysis and oxidation reactions of SiCl$_4$. It is also found that OH concentration decreases dramatically in particle formation zone where temperatures increase. This can be attributed to consumption of oxidative species and generation of HCl during silica formation.
황준영 ( Hwang Jun Yeong ),박경식 ( Park Gyeong Sig ),조광범 ( Jo Gwang Beom ),황재석 ( Hwang Jae Seog ),안성훈 ( An Seong Hun ) 대한소화기학회 2004 대한소화기학회지 Vol.43 No.4
Bullous pemphigoid is a subepidermal blistering skin disease, usually occurred in the elderly. It is an autoimmune disease associated with circulating autoantibodies directed against structural components of hemodesmosome. Rarely, it can involve the esophagus, which can be complicated by upper gastrointestinal hemorrhage. We report a case of bullous pemphigoid with esophageal mucosal desquamation and hemorrhage in patient with chronic renal failure. (Korean J Gastroenterol 2004;43:264-267)
이현호,황준영,정석호,이원남,Lee, Hyeon-Ho,Hwang, Jun-Yeong,Jeong, Seok-Ho,Lee, Won-Nam 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.1
Flame oscillation phenomena in a co-flow diffusion flame was experimentally studied with periodic fuel supply using a solenoid valve. The degree of excitation was controlled by changing the volume flux of fuel passing through the valve. Flame oscillation frequencies were measured utilizing a photodiode, a spectrum analyzer, video and high speed movies. Laser planar visualization was employed to study the correlation between the flame oscillation and the toroidal vortices. Observed are three regimes of flame oscillation, where the oscillation frequencies are for the multiples of excitation, the excitation itself and the flame natural oscillation. Both periods of natural oscillation and of excitation induced oscillation exist over one cycle of the excitation in the frequency multiplied regime. It is considered as an effect of balancing the influence of buoyancy driven vortex with that of excitation induced vortex near the excitation rate of 0.2. Flame shapes are become monotonous as increasing the excitation frequency to the range of over two fold of the natural oscillation. The flame oscillation can be modulated to the frequency of either multiples of excitation or excitation itself under certain conditions. This implies that the flame oscillation could be modulated to avoid the resonance frequency of the combustor, and shows the possibility of active control of the flame oscillation.
포스터 전시 : 췌담도 ; 총담관의 소세포 신경내분비 종양 1예
박혜원 ( Park Hye Won ),황준영 ( Hwang Jun Yeong ),장병국 ( Jang Byeong Gug ),서상혁 ( Seo Sang Hyeog ),박경식 ( Park Gyeong Sig ),조광범 ( Jo Gwang Beom ),황재석 ( Hwang Jae Seog ),안성훈 ( An Seong Hun ),강구정 ( Kang Gu Jeon 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<서론> 신경내분비 암종은 decarboxylate amine precursors (APUD system)의 잠재력을 가진 argentaffin cell로부터 기원하며, 소세포암의 96% 정도는 폐에서 기원하며, 나머지 4%는 폐외에서 기원하는데 자궁경부, 위장관, 후두, 인두, 부비동, 췌장, 흉선, 비뇨기계 등이다. 상부 위장관계의 가장 흔한 발생 부위는 위이며, 하부 위장관계에서 가장 흔한 발생 부위는 충수돌기, 회장, 직장이다. 간외 담도계의 신
대구,경북 지역 성인의 바이러스성 간염 표지자 양성률에 관한 연구 -건강검진 수진자를 대상으로-
박경식 ( Kyung Sik Park ),이영석 ( Yeong Seok Lee ),이석근 ( Seok Guen Lee ),황준영 ( Jun Young Hwang ),정우진 ( Woo Jin Chung ),조광범 ( Kwang Bum Cho ),황재석 ( Jae Seok Hwang ),안성훈 ( Sung Hoon Ahn ),박승국 ( Soong Kook Pa 대한소화기학회 2003 대한소화기학회지 Vol.41 No.6
Backgroud/Aims: In spite of continuous decrease in prevalence of hepatitis B virus (HBV) infection, hepatic diseases including hepatic cancer still are major causes of death in Korea. As a large portion of hepatic diseases is caused by HBV and hepatitis C virus (HCV) in Korea, we reviewed the serologic markers of HBV and HCV in adults in Daegu and Gyungbuk area for the last five years. Then, we compared them with the reported data of other areas. Methods: We studied total 21, 291 adults who had received medical examination at health promotion center of Dongsan Hospital from 1997 to 2001. Results: The overall serologic positivity of HBsAg and anti-HCV was 6.1% and 0.9%, respectively. Seven (0.03%) of 21, 291 were positive for both HBsAg and anti-HCV. The positivity of HBsAg was higher in male, highest in 4th and 5th decades. It decreased yearly from 1997 to 2001. The positivity of anti-HCV increased with age but there was no difference between both genders or examined years. Conclusions: The overall trend of viral markers in Daegu and Gyungbuk area was not different significantly from previously reported data of other areas. (Korean J Gastroenterol 2003;41:473-479)